Periodic System for Chemists

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Table
92
238.03

U

Uranium

Identification

CAS Number: 7440-61-1
Discovery Year: 1789
Discoverer: Martin Klaproth
Discovery Location: Germany

Properties

Atomic Mass: 238.02891 →Density: 19.1 g/cm³ →
Crust Abundance: 2.7 mg/kg
Crystal Structure: ORC

Atomic Dimensions

Atomic Radius: 175 pm →
Atomic Radius (Rahm): 283 pm
Covalent Radius: 196 pm →
Van der Waals Radius: 241 pm
Atomic Volume: 12.5 cm³/mol
Lattice Constant: 2.85 Å

Thermodynamics

Melting Point: 1405.5 K →Boiling Point: 4018 K →Specific Heat: 0.115 J/(g·K) →Thermal Conductivity: 27.5 W/(m·K) →Heat of Fusion: 12.6 kJ/mol →Heat of Vaporization: 417 kJ/mol →
Heat of Formation: 533 kJ/mol

Electronic Structure

Electron Config: [Rn] 5f3 6d 7s2
Block: f
Period: 7 →Electronegativity: 1.7 →
Oxidation States: +3, +4, +5, +6

Abundance & Geochemistry

Crust Abundance: 2.7 mg/kg
Sea Abundance: 0.0032 mg/L
Geochemical Class: rare earth & related
Goldschmidt Class: litophile

About

Uranium is a radioactive metal used as fuel in nuclear reactors and in nuclear weapons. It is naturally occurring and is the heaviest naturally abundant element.

Isotopes

U-238 238 99.27%
U-235 235 0.7204%
U-234 234 5.40e-3%

Related Elements

Category

Actinides

Same Period

89 Ac Actinium90 Th Thorium91 Pa Protactinium93 Np Neptunium94 Pu Plutonium95 Am Americium

Periodic Trends

Electronegativity →Atomic Radius →Density →Melting Point →

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